Petrie dish



NOV. 3, 1970 FALCONE ET AL 3,537,956

PETRIE DISH Filed June 26, 1967 INVENTORS. JOSEPH R. FALCONE. ANTHONY FALCONE BY FIG. 7

ATTORNEY.

United States Patent Office 3,537,956 Patented Nov. 3, 1970 3,537,956 PETRIE DISH Joseph R. Falcone, 217 Cooper Lane, Dewitt, 13214, and Anthony Falcone, Jr., 207 Oakridge Drive,

Camillns, NY. 13031 Filed June 26, 1967, Ser. No. 648,746 Int. Cl. C12b 1/04 US. Cl. 195139 3 Claims ABSTRACT OF THE DISCLOSURE A petrie dish, a container and closure disk, the container having upstanding lugs on the outer surface thereof terminating in circumferentially extending arms. The disk has notches in the periphery to permit application of the closure on the container side wall. and, upon rotation, to move the peripheral marginal portion of the disk underneath said arms.

BACKGROUND OF THE INVENTION Small containers, in the form of petrie dishes, are used for the volume production culture of certain organisms, as in the production of antibiotics. In some instances, it is to cover each petrie dish with a closure to prevent contamination of the culture, the closure usually being in the form of a disk of porous material, such as paperboard.

In the copending application, Ser. No. 527,267, filed Feb. 14, 1966, there is disclosed a petrie dish structure wherein the container is provided with upstanding lugs spaced apart circumferentially about the top edge of the container for retaining the closure lid against radial displacement.

BRIEF SUMMARY OF THE INVENTION This invention has to do with a petrie dish structure embodying an arrangement wherein the container of the combination is formed with integral means which provides ready application of the closure disk, and which functions to retain the closure disk against the top edge of the container, preventing both radial and axial displacement of the disk from the container.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an isometric view of the petrie dish structure embodying our invention.

FIG. 2 is a view taken on line 22, FIG. 1.

FIG. 3 is an enlarged view indicated by line 33, FIG. 1.

FIG. 4 is a top plan view of the container.

FIG. 5 is an enlarged view as indicated by lines 55, FIG. 4.

FIG. 6 is an enlarged view taken on line 6-6, FIG. 4.

FIG. 7 is a top plan view of the closure disk.

DETAILED DESCRIPTION The container is of circular formation having a tapered side wall 10 and a discoidal bottom 11. The upper edge 12 of the side wall is coplanar, and the side wall is formed with integral upwardly extending lugs 13. The lugs 13 are formed on the exterior surface of the side wall, and the upper ends of the lugs terminate in arms 14 which are positioned upwardly of the side wall top edge 12. The arms extend from the lugs in a direction circumferentially of the container. There are a plurality of lugs 13 and arms 14. In the embodiment of the invention shown in the drawings, there are three arms equally spaced apart circumferentially of the container. The closure disk 15 is of such diameter that the peripheal marginal portion of the disk extends radially outwardly from the top edge 12 0f the container.

The closure disk 15 is formed, in its periphery, with three notches 17. The notches 17 are circumferentially spaced apart complemental to the spacing of the arms 14. The notches 17 have a circumferential length slightly greater than the circumferential length of the arms 14. Accordingly, when the closure disk 15 is positioned with the notches 17 in registration with the arms 14, it may be positioned upon the top edge 12 of the container. The disk is then rotated in a clockwise direction, FIGS. 1 and 4, whereby the peripheral marginal portion of the closure disk moves underneath the arms 14, and the disk is then detachably locked to the container.

The under surface of the arms indicated at 20, FIGS. 3 and 5, inclines downwardly from the free ends of the arms toward the lugs 13. The under surface 20 of the arms is spaced upwardly from the top edge 12 of the side wall a distance slightly greater than the thickness of the disk 15 to permit the deges of the notches 17 to readily enter under the arms 14 upon rotation of the disk. Due to the inclined under surfaces 20 of the arms, the disk is cammed into tight engagement with the top edge surface 12 of the container.

There are lugs 23 formed on the side wall intermediate the lugs 13. The upper ends of the lugs 23 terminate c0- planar with the top edge 12. The lugs 13 and 23 are formed at their lower ends with shoulders 25 which engage the top edge 12 of the next lowermost container when the containers are arranged in stack formation.

What we claim is:

1. A petrie dish structure comprising a circular open top container, the side walls of said container having an annular coplanar closure supporting top edge a plurality of circumferentially spaced apart lugs formed integrally with said side wall on the outer surface thereof each of said lugs being formed with a closure retaining arm spaced upwardly from said top edge of the side wall and extending circumferentially thereof, a fiat, closure disk positioned on said supporting top edge with a peripheral marginal portion of the disk extending radially outwardly of said side wall and being formed with notches circumferentially spaced apart comparable to the spacing of said lugs, said notches having circumferential length comparable to the circumferential length of said arms, whereby said closure disk may be positioned on said top edge and rotated to move the extending marginal portion of the disk underneath said arms for retention of the closure disk on the container.

2. A petrie dish structure as defined in claim 1, wherein the under surfaces of said arms contiguous to said lugs is spaced upwardly from said top edge a distance less than the thickness of said closure disk.

3. A petrie dish structure as defined in claim 1, wherein the under surfaces of said arms incline downwardly from the outer ends thereof toward said top edge.

References Cited UNITED STATES PATENTS 1,470,579 10/1923 Rohdiek 220--40 2,661,862 12/1953 Howe 220-40 3,065,150 11/1962 Kavitz.

ALVIN E. TANENHOLTZ, Primary Examiner US. Cl. X.R. 220--40, 55 

